Ellipse guide



April 16, 1263 F. N. LUNDEBJERG l ELLIPSE GUIDE Filed June 30, 1961United States Patent O 3,085,341 ELLPSE GUIDE Frederick N. Lundehjerg, 4Grassy Plain Terrace, Bethel, Coun. rues .time so, 19er, ser. No.121,055 4 Claims. (Cl. 33--30) This invention relates to an ellipseguide to facilitate drawing of ellipses of different sizes andcontigurations. I-t has for an object to provide a Idevice for drawingsuch ellipses which is `of very simple construction and may be easilyoperated, as well as easily adjusted to draw ellipses of different sizesand diiferent proportions of major and minor axes of the ellipses.

With the foregoing and other objects in view, I have devised theconstruction illustrated in the accompanying drawing forming a part ofthis specification. It is, however, understood the invention is notlimited to the specific details of construction and arrangement shown,but may embody various changes and modifications within the scope of theinvention.

IIn this drawing:

FIG. I1 is a side elevation of the device;

FIG. 2 is -an end elevation looking from the right of FIG. 1;

FIG. 3 is a top plan view;

FIG. 4 is -a detail longitudinal section of lthe support for the markingimplement;

FIG. 5 is a partial side eleva-tion and partial section of the upperpart sof the upright member and the guide disc;

FIG. 6 is a plan view of the guide disc land its support, and

FIG. 7 is a detail section of the guide disc and its support.

The device is a drafting instrument for drawing ellipses of differentcongurations and sizes. It comprises an upright tubular member or post10 provided with a centering or fixed locating means 11 at lits lowerend, in the form shown comprising a point arranged to pierce a piece ofpaper or other materialen which the ellipse is to be drawn. Above thislower end is a fixed collar or flange 12 above which is a bearing 13 fora horizontal bar 14, the bearing connecting the bar to the uprightmember or post so that it may be turned in a horizontal plane about thisupright member.

Within the upper hollow portion of the tubular upright 1d is `an uprightelongated adjustable feed screw 15, connected at its upper end to anadjusting knob 16 in the form of a finger 4grip adapted to turn on aiixed washer 17 resting on the top of the member 10. .The member 10 isprovided in i-ts opposite side walls with longitudinal guide slots 18and 19, and is embraced by an elongated opening 20 in yguide disc 21.This disc is preferably circular in shape, but could be oblong or othershapes, if desired. It is supported for adjustment by the screw by meansof a center bearing ring or collar 22 threaded on the screw 15, -andsupported by integral oppositely extending pivot pins 23 journalled inthe disc 21 at the opposite sides of the opening 2t). This support forthe disc permits the disc to be tipped to various angles to thehorizontal about the pivotal support 23.

Mea-ns is provided for connecting one edge of the disc to the uprightmember 10. In the arrangement shown, this comprises a Wire or bar 24pivotally connected at its opposite ends as at 25 to the washer 17 andat its lower end at 26 to the edge of the disc 21. It will be seen thatby cooperation of this link and the threaded connection 22 of the disct-o the adjusting screw 15, rotation of the screw will adjust the ring22 up or down, and thus vary the angle which the disc 21 has with thehorizontal plane.

The horizontal bar 14 is also a tubular member, and mounted forlongitudinal sliding movement in this bar are supporting blocks 27 and28. On top of the bar is a support 2,9 which may 1be a at strip withdownwardly turned ends '-30 and 31 resting on top of the bar 14, andcarried by thi-s support are upright strips or pins 32 passing throughthe top portion of the support 29 and at their lower ends driven intothe blocks 27 and 28 so as to be supported thereby. Carried by themembers 32 is an adjusting screw 33 provided with a linger gripopera-ting knob 34, this screw having bearing support at its oppositeends in the members 32.

Having threaded engagement with the screw 33 is an upright, downwardlyextending bar 35 provided with a holder 36 in the form of means forgripping a lead or pen 37, or it could be a scriber. Thus this bar 35and marking element forms a marking implement carried by thesupport 29and ladjustable longitudinally thereon toward and from the centeringupright member 10, the element 35 and the marking means forming adepending marking implement that is guided tor longitiudinal movement bypassing through an elongated slot 38 in the support 29, and furtherlongitudinal slots 39' and 40 4in the tubular bar 14. 'Ilhe member 35may also have a guide ange or collar 35a at the under side of bar 14.The upper slot 39 also provides guide means for the elements 32. Anupright guide, in Ithe present oase in the form of an upright bar 41, isconnected to the support 29 at its forward end, as indicated at 42, andthis is in position to engage the rim or edge of the guide disc 21 andof a length to engage this edge at 'various heights to which the disc 21may be adjusted in the upright post or member 10, and it is held yinengagement with the edge of the disc by a coil spring 43 connected tothe guide 41 and to the upright member 10 by any suitable means, such asthe collar 44. The spring is thus biased to hold the guide -41 inengagement with the disc during the rotating or turning movement of thes or other material on which it is desired to draw an ellipse,

the member 10 is held in an upright position and the bar 14 carrying themarking implement 37 may be rotated about this upright, the guide 41being held against the edge of the disc 21 during ,this turning movementby means of the spring 43. The proportion of the major and minor axes ofthe ellipse will be determined by the angle `at which the disc 21 isadjusted to the horizontal. lf it is horizontal or parallel .to thepaper the ligure will be a circle if the disc is circular, but ifinclined, as shown in FIGS. 1 and 2, the gure will be `an ellipse, andas indicated, the relative lengths of the major and minor iaxes will'depend on the angle of inclination of 'this disc; the greater theinclination, the shorter will be the minor axis. The size of the ellipsewill lbe determined by the distance between the centering means 11 andthe marking means 37, which may be adjusted by the screw 33.

There may be a scale or indicator 45 on the side of the upright member10 lover which a pointer y46 on the ring 22 or pivot may slide toindicate the adjustment of this ring and the angular position of thedisc 21. Similarly, la scale 47 may be provided on the member 29cooperating with a pointer 48 ion the depending member 35 -to indicatethe .distance or adjustment of the marking member 37 from the center 11.This will determine the size iof the ellipse drawn by the marking meansas the |bar 14 is rotated yabout the upright member 10.

It will be clear from the above that the `device is of very simpleconstruction, involving a small number of parts, and that it may beeasily and quickly set to produce the desired size and shape of theellipse to be drawn. As the supporting member 10 is in a vertical 3upright position, yand the marking implement supporting bar 14 extendslater-ally fnom it in a horizontal plane, the Amarking means 37 has auniform bearing on the surface of the paper for the complete revolutionof the bar, giving a uniform line for the ent-ire ellipse.

Having thus set fo-rth the nature `of my invention, I

claim:

1. An ellipse guide comprising an upright member having vertical guidemeans and provided with a centering means at the lower end thereof and abearing above said lower end, a horizontal bar mounted on said bearingto rotate about said upright member, a support. mounted on said bar forlongitudinal movement thereon, a depending marking implement mounted forlongitudinal adjustment on theV support, an adjusting screw on thesupport having threaded connection with the marking implement forshifting it on the support, a guide disc, transverse pivot means for theAdisc: mounted in said vertical guide means on the upright member, meanspivotally connecting `one edge of the disc to said member, means forshifting the pivot means longitudinally of the upright member to varythe angular position of the disc on said` pivot means, a guide means onthe support engaging the edge of the disc, and spring means connected tothe support resiliently retaining lthe guide means in contact with theedge of the disc.

2. An ellipse guide comprising an upright tubular member provided withlongitudinal guide slots in side walls thereof, a guide disc providedwith an opening embracing the upright member, a transverse pivot meansfor the disc extending transversely of the upright member through saidslots, means connecting oneV edge of the disc to the uprightl member, ascrew in the upright member having threaded connection with said pivotmeans to shift it longitudinally of the upright member to adjust thedisc to different angular positions, means for operating the screw, ahorizontal bar pivoted at one end to the upright member to turn aboutsaid member, a support mounted for longitudinal movement on the bar, adepending marking implement carried by thev support, a guide on thesupport engaging the edge of the disc, and

spring means connected between the support and the up-v right member ltoretain the guide against the edge of the disc.

3. An ellipse guide comprising an upright tubular member provided withlongitudinal guide slots in side walls thereof, a guide `disc providedwith an opening embracing the upright member, a transverse pivot meansfor the disc extending transversely of the upright member through saidslots, means connecting one edge of the disc to the of Ithe bar aboutsaid member, said bar provided with longitudinal track means, a supportmeans in said track means, an adjusting screw on the support means, adepending marking implement threaded on the adjusting screw foradjustment on the support means, a guide means on the support meansengaging the edge of the disc, and spring means connected between thesupport means and the upright member and retaining the guide means inengagement with lthe edge of the disc during turning movements of thebar.

4. An ellipsev guide comprising an upright member provided withlongitudinal guide means and -a centering means at its lower end, aguide disc provided with an "opening embracing said member, a transversepivot means for the disc mounted in said guide means, means connecting.one edge lof the disc with the upright member, a screw mounted in theupright member and having threaded connection with said pivot means toshift it longitudinally lof the upright member to adjust [the disc todiierent angular positions, la horizont-al tubular bar, a bearingconnecting `one end of the bar to the upright member for turningmovements of ,the bar about said member, a longitudinally slidableelement in said tubular bar means, ia support carried by said s'lidableelement, a depending marking implement mounted -for longitudinaladjustment relative to said support, lan `adjusting screw connected tothe marking implement for shifting it relative to Vthe support, a guideelement on the support engaging the edge of the disc, and spring meansinterconnecting the support land the upright member and biased to shiftlthe support toward the upright member to retain 'the guide element inengagement with the disc `during turning movements `of the bar about theupright member.

References Cited in the tile of this patent UNITED STATES PATENTS1,507,535 Wason Sept. 2, 1924 FOREIGN PATENTS 105,735 Switzerland July1, 1924 603,712 Germany Oct. 6, 1934

1. AN ELLIPSE GUIDE COMPRISING AN UPRIGHT MEMBER HAVING VERTICAL GUIDE MEANS AND PROVIDED WITH A CENTERING MEANS AT THE LOWER END THEREOF AND A BEARING ABOVE SAID LOWER END, A HORIZONTAL BAR MOUNTED ON SAID BEARING TO ROTATE ABOUT SAID UPRIGHT MEMBER, A SUPPORT MOUNTED ON SAID BAR FOR LONGITUDINAL MOVEMENT THEREON, A DEPENDING MARKING IMPLEMENT MOUNTED FOR LONGITUDINAL ADJUSTMENT ON THE SUPPORT, AN ADJUSTING SCREW ON THE SUPPORT HAVING THREADED CONNECTION WITH THE MARKING IMPLEMENT FOR SHIFTING IT ON THE SUPPORT, A GUIDE DISC, TRANSVERSE PIVOT MEANS FOR THE DISC MOUNTED IN SAID VERTICAL GUIDE MEANS ON THE UPRIGHT MEMBER, MEANS PIVOTALLY CONNECTING ONE EDGE OF THE DISC TO SAID MEMBER, MEANS FOR SHIFTING THE PIVOT MEANS LONGITUDINALLY OF THE UPRIGHT MEMBER TO VARY THE ANGULAR POSITION OF THE DISC ON SAID PIVOT MEANS, A GUIDE MEANS ON THE SUPPORT ENGAGING THE EDGE OF THE DISC, AND SPRING MEANS CONNECTED TO THE SUPPORT RESILIENTLY RETAINING THE GUIDE MEANS IN CONTACT WITH THE EDGE OF THE DISC. 